单体模式

//看到了写下来！ 备忘用滴
public class SingletonText {
 private String name;
 private static SingletonText instance;
 private  SingletonText()
 {
  System.out.print("loading");
 }
 public static SingletonText getInstance()
 {
  if(instance==null)
  {
   instance=new SingletonText();
  }
  return instance;
 }
 public static void main(String[] args) {
  SingletonText t1=SingletonText.getInstance();
  SingletonText t2=SingletonText.getInstance();
  t2.setName("123");
  System.out.print(t2==t1); 
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
}